Monday March 5, 2007

SNC 1D
- Take up work from page 252 (#2-4)
- Lesson/Note: Valence Electrons/Octet Rule
- Demonstration: Reactivity of an Element with 1 vs. 2 vs. 3 valence electrons.
Result:
Sodium (1 valence electron): Most Reactive
Magnesium (2 valence electrons): Less reactive
Aluminum (3 valence electrons): Least reactive of the three

Conclusion: An element which needs to lose (or gain) fewer electrons in order to obtain a full outer shell will be more reactive than an element which needs to lose (or gain) more electrons.

Assigned work: Read p. 256-264, Do p. 264 # 1,2,3,5,6



SBI 3C
- Class discussion as to how we could design and conduct an experiment to determine whether various food molecules will move across a semi-permeable membrane.
- Hand out: Size of Molecules Lab
- Prepare "model of cell" (dialysis bag) for "Size of Molecules" Lab. Make a hypothesis.
- Note/Lesson: Chemical Reactions in Cells Part 2.